An examination of the Wide Area Network (WAN) technologies and network services required in converged applications in a complex network. Covers the criteria for selecting network devices and WAN technologies to meet network requirements. Students troubleshoot and resolve common problems with network devices and data link protocols; and they implement Network Address Translation (NAT), IP security (IPSec), and virtual private network (VPN) operations in a complex network. This is the last in a series of four courses in the Cisco Networking Technology (CNT) curriculum.